Byzantines did play a role in the first crusade as they allowed the crusaders to pass through their territory, but provided no support.
The First Crusade (1096–1099) was the first in a line of crusades, or religious warfare, that the Latin Church of the Middle Ages started, encouraged, and occasionally oversaw. The Holy Land's liberation from Islamic dominion was the goal. Jerusalem had been governed by Muslims for hundreds of years, but by the 11th century, the Seljuk invasion of the area threatened the Byzantine Empire as well as the local Christian communities and Western pilgrimages. The Byzantine emperor Alexios I Komnenos requested military assistance from the Council of Piacenza in 1095 so that his kingdom might fight the Seljuk-led Turks. This was the first crusade initiative.
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weapons and articles used for fighting
The correct answers are working on a history test and solving a sudoku puzzle.
The reason for this is because you can listen to music and don't need to be explicitly conscious - imagine drifting away in thoughts while you listen to music, or do something completely unrelated.
The same goes for riding a bike. Once you know how to ride a bike and know the path where you're going, your attention and explicit consciousness can be allocated somewhere completely else :)
The correct answers are the middle two - because of them require you to be present and attentive of the situation and what you have to do.
It increased the demand for coal and iron. we need the iron to build things and the coal to power things. Remember coal is what powered the steam engine.